31а * (-6) = - 186а
5/9 * (- 45с) = - 25с
0,36у * у = 0,36у^2
-20 * 0,7b = - 14b
7/11 * 3/7d = 3/11d
- 1,2 * (-5z) = 6z
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245x - 100,1 + 265x + 99,9 = 510x - 0,2
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2/3y + 48 + 2 1/7y - 51 = 2/3y + 15/7y - 3 = 14/21y+45/21y-3= 59/21y-3 =
= 2 17/21y - 3
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- 0,09 - 13,01b + 0,9a + 0,19 = 0,9a -13,01b + 0,1
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- 41 3/9n + m - 8 4/11n - 22,2m = - 21,2m - (49n + 33/99n+36/99n) =
= - 21,2m - 49 69/99n = - 21,2m - 49 23/33n